<?php

// Stop the theme from killing WordPress if BuddyPress is not enabled.
if ( !class_exists( 'BP_Core_User' ) )
	return false;

// Register the widget columns
register_sidebars( 1,
	array(
		'name'          => 'Sidebar',
		'before_widget' => '<div id="%1$s" class="widget %2$s">',
		'after_widget'  => '</div>',
		'before_title'  => '<h3 class="widgettitle">',
		'after_title'   => '</h3>'
	)
);

// Load the AJAX functions for the theme
require_once( TEMPLATEPATH . '/_inc/ajax.php' );

// Load the javascript for the theme
wp_enqueue_script( 'dtheme-ajax-js', get_template_directory_uri() . '/_inc/global.js', array( 'jquery' ) );

// Add words that we need to use in JS to the end of the page so they can be translated and still used.
$params = array(
	'my_favs'           => __( 'My Favorites', 'buddypress' ),
	'accepted'          => __( 'Accepted', 'buddypress' ),
	'rejected'          => __( 'Rejected', 'buddypress' ),
	'show_all_comments' => __( 'Show all comments for this thread', 'buddypress' ),
	'show_all'          => __( 'Show all', 'buddypress' ),
	'comments'          => __( 'comments', 'buddypress' ),
	'close'             => __( 'Close', 'buddypress' ),
	'mention_explain'   => sprintf( __( "%s is a unique identifier for %s that you can type into any message on this site. %s will be sent a notification and a link to your message any time you use it.", 'buddypress' ), '@' . bp_get_displayed_user_username(), bp_get_user_firstname( bp_get_displayed_user_fullname() ), bp_get_user_firstname( bp_get_displayed_user_fullname() ) )
);
wp_localize_script( 'dtheme-ajax-js', 'BP_DTheme', $params );

/**
 * Add the JS needed for blog comment replies
 *
 * @package BuddyPress Theme
 * @since 1.2
 */
function bp_dtheme_add_blog_comments_js() {
	if ( is_singular() ) wp_enqueue_script( 'comment-reply' );
}
add_action( 'template_redirect', 'bp_dtheme_add_blog_comments_js' );

/**
 * HTML for outputting blog comments as defined by the WP comment API
 *
 * @param mixed $comment Comment record from database
 * @param array $args Arguments from wp_list_comments() call
 * @param int $depth Comment nesting level
 * @see wp_list_comments()
 * @package BuddyPress Theme
 * @since 1.2
 */
function bp_dtheme_blog_comments( $comment, $args, $depth ) {
	$GLOBALS['comment'] = $comment; ?>

	<?php if ( 'pingback' == $comment->comment_type ) return false; ?>

	<li id="comment-<?php comment_ID(); ?>">
		<div class="comment-avatar-box">
			<div class="avb">
				<a href="<?php echo get_comment_author_url() ?>" rel="nofollow">
					<?php if ( $comment->user_id ) : ?>
						<?php echo bp_core_fetch_avatar( array( 'item_id' => $comment->user_id, 'width' => 50, 'height' => 50, 'email' => $comment->comment_author_email ) ); ?>
					<?php else : ?>
						<?php echo get_avatar( $comment, 50 ) ?>
					<?php endif; ?>
				</a>
			</div>
		</div>

		<div class="comment-content">

			<div class="comment-meta">
				<a href="<?php echo get_comment_author_url() ?>" rel="nofollow"><?php echo get_comment_author(); ?></a> <?php _e( 'said:', 'buddypress' ) ?>
				<em><?php _e( 'On', 'buddypress' ) ?> <a href="#comment-<?php comment_ID() ?>" title=""><?php comment_date() ?></a></em>
			</div>

			<?php if ( $comment->comment_approved == '0' ) : ?>
			 	<em class="moderate"><?php _e('Your comment is awaiting moderation.'); ?></em><br />
			<?php endif; ?>

			<?php comment_text() ?>

			<div class="comment-options">
				<?php echo comment_reply_link( array('depth' => $depth, 'max_depth' => $args['max_depth'] ) ) ?>
				<?php edit_comment_link( __( 'Edit' ),'','' ); ?>
			</div>

		</div>
<?php
}

/**
 * Filter the dropdown for selecting the page to show on front to include "Activity Stream"
 *
 * @param string $page_html A list of pages as a dropdown (select list)
 * @see wp_dropdown_pages()
 * @return string
 * @package BuddyPress Theme
 * @since 1.2
 */
function bp_dtheme_wp_pages_filter( $page_html ) {
	if ( !bp_is_active( 'activity' ) )
		return $page_html;

	if ( 'page_on_front' != substr( $page_html, 14, 13 ) )
		return $page_html;

	$selected = false;
	$page_html = str_replace( '</select>', '', $page_html );

	if ( bp_dtheme_page_on_front() == 'activity' )
		$selected = ' selected="selected"';

	$page_html .= '<option class="level-0" value="activity"' . $selected . '>' . __( 'Activity Stream', 'buddypress' ) . '</option></select>';
	return $page_html;
}
add_filter( 'wp_dropdown_pages', 'bp_dtheme_wp_pages_filter' );

/**
 * Hijack the saving of page on front setting to save the activity stream setting
 *
 * @param $string $oldvalue Previous value of get_option( 'page_on_front' )
 * @param $string $oldvalue New value of get_option( 'page_on_front' )
 * @return string
 * @package BuddyPress Theme
 * @since 1.2
 */
function bp_dtheme_page_on_front_update( $oldvalue, $newvalue ) {
	if ( !is_admin() || !is_super_admin() )
		return false;

	if ( 'activity' == $_POST['page_on_front'] )
		return 'activity';
	else
		return $oldvalue;
}
add_action( 'pre_update_option_page_on_front', 'bp_dtheme_page_on_front_update', 10, 2 );

/**
 * Load the activity stream template if settings allow
 *
 * @param string $template Absolute path to the page template 
 * @return string
 * @global WP_Query $wp_query WordPress query object
 * @package BuddyPress Theme
 * @since 1.2
 */
function bp_dtheme_page_on_front_template( $template ) {
	global $wp_query;

	if ( empty( $wp_query->post->ID ) )
		return locate_template( array( 'activity/index.php' ), false );
	else
		return $template;
}
add_filter( 'page_template', 'bp_dtheme_page_on_front_template' );

/**
 * Return the ID of a page set as the home page.
 *
 * @return false|int ID of page set as the home page
 * @package BuddyPress Theme
 * @since 1.2
 */
function bp_dtheme_page_on_front() {
	if ( 'page' != get_option( 'show_on_front' ) )
		return false;

	return apply_filters( 'bp_dtheme_page_on_front', get_option( 'page_on_front' ) );
}

/**
 * Force the page ID as a string to stop the get_posts query from kicking up a fuss.
 *
 * @global WP_Query $wp_query WordPress query object
 * @package BuddyPress Theme
 * @since 1.2
 */
function bp_dtheme_fix_get_posts_on_activity_front() {
	global $wp_query;

	if ( !empty($wp_query->query_vars['page_id']) && 'activity' == $wp_query->query_vars['page_id'] )
		$wp_query->query_vars['page_id'] = '"activity"';
}
add_action( 'pre_get_posts', 'bp_dtheme_fix_get_posts_on_activity_front' );

/**
 * WP 3.0 requires there to be a non-null post in the posts array
 *
 * @param array $posts Posts as retrieved by WP_Query
 * @global WP_Query $wp_query WordPress query object
 * @return array
 * @package BuddyPress Theme
 * @since 1.2.5
 */
function bp_dtheme_fix_the_posts_on_activity_front( $posts ) {
	global $wp_query;

	// NOTE: the double quotes around '"activity"' are thanks to our previous function bp_dtheme_fix_get_posts_on_activity_front()
	if ( empty( $posts ) && !empty( $wp_query->query_vars['page_id'] ) && '"activity"' == $wp_query->query_vars['page_id'] )
		$posts = array( (object) array( 'ID' => 'activity' ) );

	return $posts;
}
add_filter( 'the_posts', 'bp_dtheme_fix_the_posts_on_activity_front' );

/**
 * bp_dtheme_activity_secondary_avatars()
 *
 * Add secondary avatar image to this activity stream's record, if supported
 *
 * @param string $action The text of this activity
 * @param BP_Activity_Activity $activity Activity object
 * @return string
 * @package BuddyPress Theme
 * @since 1.2.6
 */
function bp_dtheme_activity_secondary_avatars( $action, $activity ) {
	switch ( $activity->component ) {
		case 'groups' :
		case 'friends' :
			// Only insert avatar if one exists
			if ( $secondary_avatar = bp_get_activity_secondary_avatar() ) {
				$reverse_content = strrev( $action );
				$position        = strpos( $reverse_content, 'a<' );
				$action          = substr_replace( $action, $secondary_avatar, -$position - 2, 0 );
			}
			break;
	}

	return $action;
}
add_filter( 'bp_get_activity_action_pre_meta', 'bp_dtheme_activity_secondary_avatars', 10, 2 );

/**
 * Custom header image support. You can remove this entirely in a child theme by adding this line
 * to your functions.php: define( 'BP_DTHEME_DISABLE_CUSTOM_HEADER', true );
 *
 * @package BuddyPress Theme
 * @since 1.2
 */
function bp_dtheme_add_custom_header_support() {
	// Set the defaults for the custom header image (http://ryan.boren.me/2007/01/07/custom-image-header-api/)
	define( 'HEADER_TEXTCOLOR', 'FFFFFF' );
	define( 'HEADER_IMAGE', '%s/_inc/images/default_header.jpg' ); // %s is theme dir uri
	define( 'HEADER_IMAGE_WIDTH', 1250 );
	define( 'HEADER_IMAGE_HEIGHT', 125 );

	function bp_dtheme_header_style() { ?>
		<style type="text/css">
			#header { background-image: url(<?php header_image() ?>); }
			<?php if ( 'blank' == get_header_textcolor() ) { ?>
			#header h1, #header #desc { display: none; }
			<?php } else { ?>
			#header h1 a, #desc { color:#<?php header_textcolor() ?>; }
			<?php } ?>
		</style>
	<?php
	}

	function bp_dtheme_admin_header_style() { ?>
		<style type="text/css">
			#headimg {
				position: relative;
				color: #fff;
				background: url(<?php header_image() ?>);
				-moz-border-radius-bottomleft: 6px;
				-webkit-border-bottom-left-radius: 6px;
				-moz-border-radius-bottomright: 6px;
				-webkit-border-bottom-right-radius: 6px;
				margin-bottom: 20px;
				height: 100px;
				padding-top: 25px;
			}

			#headimg h1{
				position: absolute;
				bottom: 15px;
				left: 15px;
				width: 44%;
				margin: 0;
				font-family: Arial, Tahoma, sans-serif;
			}
			#headimg h1 a{
				color:#<?php header_textcolor() ?>;
				text-decoration: none;
				border-bottom: none;
			}
			#headimg #desc{
				color:#<?php header_textcolor() ?>;
				font-size:1em;
				margin-top:-0.5em;
			}

			#desc {
				display: none;
			}

			<?php if ( 'blank' == get_header_textcolor() ) { ?>
			#headimg h1, #headimg #desc {
				display: none;
			}
			#headimg h1 a, #headimg #desc {
				color:#<?php echo HEADER_TEXTCOLOR ?>;
			}
			<?php } ?>
		</style>
	<?php
	}
	add_custom_image_header( 'bp_dtheme_header_style', 'bp_dtheme_admin_header_style' );
}
if ( !defined( 'BP_DTHEME_DISABLE_CUSTOM_HEADER' ) )
	add_action( 'init', 'bp_dtheme_add_custom_header_support' );

/**
 * Show a notice when the theme is activated - workaround by Ozh (http://old.nabble.com/Activation-hook-exist-for-themes--td25211004.html)
 *
 * @package BuddyPress Theme
 * @since 1.2
 */
function bp_dtheme_show_notice() { ?>
	<div id="message" class="updated fade">
		<p><?php printf( __( 'Theme activated! This theme contains <a href="%s">custom header image</a> support and <a href="%s">sidebar widgets</a>.', 'buddypress' ), admin_url( 'themes.php?page=custom-header' ), admin_url( 'widgets.php' ) ) ?></p>
	</div>

	<style type="text/css">#message2, #message0 { display: none; }</style>
	<?php
}
if ( is_admin() && isset($_GET['activated'] ) && $pagenow == "themes.php" )
	add_action( 'admin_notices', 'bp_dtheme_show_notice' );


// Member Buttons
if ( bp_is_active( 'friends' ) )
	add_action( 'bp_member_header_actions',    'bp_add_friend_button' );

if ( bp_is_active( 'activity' ) )
	add_action( 'bp_member_header_actions',    'bp_send_public_message_button' );

if ( bp_is_active( 'messages' ) )
	add_action( 'bp_member_header_actions',    'bp_send_private_message_button' );

// Group Buttons
if ( bp_is_active( 'groups' ) ) {
	add_action( 'bp_group_header_actions',     'bp_group_join_button' );
	add_action( 'bp_group_header_actions',     'bp_group_new_topic_button' );
	add_action( 'bp_directory_groups_actions', 'bp_group_join_button' );
}

// Blog Buttons
if ( bp_is_active( 'blogs' ) )
	add_action( 'bp_directory_blogs_actions',  'bp_blogs_visit_blog_button' );

?>


<?php
/**
 * TwentyTen functions and definitions
 *
 * Sets up the theme and provides some helper functions. Some helper functions
 * are used in the theme as custom template tags. Others are attached to action and
 * filter hooks in WordPress to change core functionality.
 *
 * The first function, twentyten_setup(), sets up the theme by registering support
 * for various features in WordPress, such as post thumbnails, navigation menus, and the like.
 *
 * When using a child theme (see http://codex.wordpress.org/Theme_Development and
 * http://codex.wordpress.org/Child_Themes), you can override certain functions
 * (those wrapped in a function_exists() call) by defining them first in your child theme's
 * functions.php file. The child theme's functions.php file is included before the parent
 * theme's file, so the child theme functions would be used.
 *
 * Functions that are not pluggable (not wrapped in function_exists()) are instead attached
 * to a filter or action hook. The hook can be removed by using remove_action() or
 * remove_filter() and you can attach your own function to the hook.
 *
 * We can remove the parent theme's hook only after it is attached, which means we need to
 * wait until setting up the child theme:
 *
 * <code>
 * add_action( 'after_setup_theme', 'my_child_theme_setup' );
 * function my_child_theme_setup() {
 *     // We are providing our own filter for excerpt_length (or using the unfiltered value)
 *     remove_filter( 'excerpt_length', 'twentyten_excerpt_length' );
 *     ...
 * }
 * </code>
 *
 * For more information on hooks, actions, and filters, see http://codex.wordpress.org/Plugin_API.
 *
 * @package WordPress
 * @subpackage Twenty_Ten
 * @since Twenty Ten 1.0
 */

/**
 * Set the content width based on the theme's design and stylesheet.
 *
 * Used to set the width of images and content. Should be equal to the width the theme
 * is designed for, generally via the style.css stylesheet.
 */
if ( ! isset( $content_width ) )
	$content_width = 640;

/** Tell WordPress to run twentyten_setup() when the 'after_setup_theme' hook is run. */
add_action( 'after_setup_theme', 'twentyten_setup' );

if ( ! function_exists( 'twentyten_setup' ) ):
/**
 * Sets up theme defaults and registers support for various WordPress features.
 *
 * Note that this function is hooked into the after_setup_theme hook, which runs
 * before the init hook. The init hook is too late for some features, such as indicating
 * support post thumbnails.
 *
 * To override twentyten_setup() in a child theme, add your own twentyten_setup to your child theme's
 * functions.php file.
 *
 * @uses add_theme_support() To add support for post thumbnails and automatic feed links.
 * @uses register_nav_menus() To add support for navigation menus.
 * @uses add_custom_background() To add support for a custom background.
 * @uses add_editor_style() To style the visual editor.
 * @uses load_theme_textdomain() For translation/localization support.
 * @uses add_custom_image_header() To add support for a custom header.
 * @uses register_default_headers() To register the default custom header images provided with the theme.
 * @uses set_post_thumbnail_size() To set a custom post thumbnail size.
 *
 * @since Twenty Ten 1.0
 */
function twentyten_setup() {

	// This theme styles the visual editor with editor-style.css to match the theme style.
	add_editor_style();

	// Post Format support. You can also use the legacy "gallery" or "asides" (note the plural) categories.
	add_theme_support( 'post-formats', array( 'aside', 'gallery' ) );

	// This theme uses post thumbnails
	add_theme_support( 'post-thumbnails' );

	// Add default posts and comments RSS feed links to head
	add_theme_support( 'automatic-feed-links' );

	// Make theme available for translation
	// Translations can be filed in the /languages/ directory
	load_theme_textdomain( 'twentyten', TEMPLATEPATH . '/languages' );

	$locale = get_locale();
	$locale_file = TEMPLATEPATH . "/languages/$locale.php";
	if ( is_readable( $locale_file ) )
		require_once( $locale_file );

	// This theme uses wp_nav_menu() in one location.
	register_nav_menus( array(
		'primary' => __( 'Primary Navigation', 'twentyten' ),
	) );

	// This theme allows users to set a custom background
	add_custom_background();

	// Your changeable header business starts here
	if ( ! defined( 'HEADER_TEXTCOLOR' ) )
		define( 'HEADER_TEXTCOLOR', '' );

	// No CSS, just IMG call. The %s is a placeholder for the theme template directory URI.
	if ( ! defined( 'HEADER_IMAGE' ) )
		define( 'HEADER_IMAGE', '%s/images/headers/path.jpg' );

	// The height and width of your custom header. You can hook into the theme's own filters to change these values.
	// Add a filter to twentyten_header_image_width and twentyten_header_image_height to change these values.
	define( 'HEADER_IMAGE_WIDTH', apply_filters( 'twentyten_header_image_width', 940 ) );
	define( 'HEADER_IMAGE_HEIGHT', apply_filters( 'twentyten_header_image_height', 198 ) );

	// We'll be using post thumbnails for custom header images on posts and pages.
	// We want them to be 940 pixels wide by 198 pixels tall.
	// Larger images will be auto-cropped to fit, smaller ones will be ignored. See header.php.
	set_post_thumbnail_size( HEADER_IMAGE_WIDTH, HEADER_IMAGE_HEIGHT, true );

	// Don't support text inside the header image.
	if ( ! defined( 'NO_HEADER_TEXT' ) )
		define( 'NO_HEADER_TEXT', true );

	// Add a way for the custom header to be styled in the admin panel that controls
	// custom headers. See twentyten_admin_header_style(), below.
	add_custom_image_header( '', 'twentyten_admin_header_style' );

	// ... and thus ends the changeable header business.

	// Default custom headers packaged with the theme. %s is a placeholder for the theme template directory URI.
	register_default_headers( array(
		'berries' => array(
			'url' => '%s/images/headers/berries.jpg',
			'thumbnail_url' => '%s/images/headers/berries-thumbnail.jpg',
			/* translators: header image description */
			'description' => __( 'Berries', 'twentyten' )
		),
		'cherryblossom' => array(
			'url' => '%s/images/headers/cherryblossoms.jpg',
			'thumbnail_url' => '%s/images/headers/cherryblossoms-thumbnail.jpg',
			/* translators: header image description */
			'description' => __( 'Cherry Blossoms', 'twentyten' )
		),
		'concave' => array(
			'url' => '%s/images/headers/concave.jpg',
			'thumbnail_url' => '%s/images/headers/concave-thumbnail.jpg',
			/* translators: header image description */
			'description' => __( 'Concave', 'twentyten' )
		),
		'fern' => array(
			'url' => '%s/images/headers/fern.jpg',
			'thumbnail_url' => '%s/images/headers/fern-thumbnail.jpg',
			/* translators: header image description */
			'description' => __( 'Fern', 'twentyten' )
		),
		'forestfloor' => array(
			'url' => '%s/images/headers/forestfloor.jpg',
			'thumbnail_url' => '%s/images/headers/forestfloor-thumbnail.jpg',
			/* translators: header image description */
			'description' => __( 'Forest Floor', 'twentyten' )
		),
		'inkwell' => array(
			'url' => '%s/images/headers/inkwell.jpg',
			'thumbnail_url' => '%s/images/headers/inkwell-thumbnail.jpg',
			/* translators: header image description */
			'description' => __( 'Inkwell', 'twentyten' )
		),
		'path' => array(
			'url' => '%s/images/headers/path.jpg',
			'thumbnail_url' => '%s/images/headers/path-thumbnail.jpg',
			/* translators: header image description */
			'description' => __( 'Path', 'twentyten' )
		),
		'sunset' => array(
			'url' => '%s/images/headers/sunset.jpg',
			'thumbnail_url' => '%s/images/headers/sunset-thumbnail.jpg',
			/* translators: header image description */
			'description' => __( 'Sunset', 'twentyten' )
		)
	) );
}
endif;

if ( ! function_exists( 'twentyten_admin_header_style' ) ) :
/**
 * Styles the header image displayed on the Appearance > Header admin panel.
 *
 * Referenced via add_custom_image_header() in twentyten_setup().
 *
 * @since Twenty Ten 1.0
 */
function twentyten_admin_header_style() {
?>
<style type="text/css">
/* Shows the same border as on front end */
#headimg {
	border-bottom: 1px solid #000;
	border-top: 4px solid #000;
}
/* If NO_HEADER_TEXT is false, you would style the text with these selectors:
	#headimg #name { }
	#headimg #desc { }
*/
</style>
<?php
}
endif;

/**
 * Get our wp_nav_menu() fallback, wp_page_menu(), to show a home link.
 *
 * To override this in a child theme, remove the filter and optionally add
 * your own function tied to the wp_page_menu_args filter hook.
 *
 * @since Twenty Ten 1.0
 */
function twentyten_page_menu_args( $args ) {
	$args['show_home'] = true;
	return $args;
}
add_filter( 'wp_page_menu_args', 'twentyten_page_menu_args' );

/**
 * Sets the post excerpt length to 40 characters.
 *
 * To override this length in a child theme, remove the filter and add your own
 * function tied to the excerpt_length filter hook.
 *
 * @since Twenty Ten 1.0
 * @return int
 */
function twentyten_excerpt_length( $length ) {
	return 40;
}
add_filter( 'excerpt_length', 'twentyten_excerpt_length' );

/**
 * Returns a "Continue Reading" link for excerpts
 *
 * @since Twenty Ten 1.0
 * @return string "Continue Reading" link
 */
function twentyten_continue_reading_link() {
	return ' <a href="'. get_permalink() . '">' . __( 'Continue reading <span class="meta-nav">&rarr;</span>', 'twentyten' ) . '</a>';
}

/**
 * Replaces "[...]" (appended to automatically generated excerpts) with an ellipsis and twentyten_continue_reading_link().
 *
 * To override this in a child theme, remove the filter and add your own
 * function tied to the excerpt_more filter hook.
 *
 * @since Twenty Ten 1.0
 * @return string An ellipsis
 */
function twentyten_auto_excerpt_more( $more ) {
	return ' &hellip;' . twentyten_continue_reading_link();
}
add_filter( 'excerpt_more', 'twentyten_auto_excerpt_more' );

/**
 * Adds a pretty "Continue Reading" link to custom post excerpts.
 *
 * To override this link in a child theme, remove the filter and add your own
 * function tied to the get_the_excerpt filter hook.
 *
 * @since Twenty Ten 1.0
 * @return string Excerpt with a pretty "Continue Reading" link
 */
function twentyten_custom_excerpt_more( $output ) {
	if ( has_excerpt() && ! is_attachment() ) {
		$output .= twentyten_continue_reading_link();
	}
	return $output;
}
add_filter( 'get_the_excerpt', 'twentyten_custom_excerpt_more' );

/**
 * Remove inline styles printed when the gallery shortcode is used.
 *
 * Galleries are styled by the theme in Twenty Ten's style.css. This is just
 * a simple filter call that tells WordPress to not use the default styles.
 *
 * @since Twenty Ten 1.2
 */
add_filter( 'use_default_gallery_style', '__return_false' );

/**
 * Deprecated way to remove inline styles printed when the gallery shortcode is used.
 *
 * This function is no longer needed or used. Use the use_default_gallery_style
 * filter instead, as seen above.
 *
 * @since Twenty Ten 1.0
 * @deprecated Deprecated in Twenty Ten 1.2 for WordPress 3.1
 *
 * @return string The gallery style filter, with the styles themselves removed.
 */
function twentyten_remove_gallery_css( $css ) {
	return preg_replace( "#<style type='text/css'>(.*?)</style>#s", '', $css );
}
// Backwards compatibility with WordPress 3.0.
if ( version_compare( $GLOBALS['wp_version'], '3.1', '<' ) )
	add_filter( 'gallery_style', 'twentyten_remove_gallery_css' );

if ( ! function_exists( 'twentyten_comment' ) ) :
/**
 * Template for comments and pingbacks.
 *
 * To override this walker in a child theme without modifying the comments template
 * simply create your own twentyten_comment(), and that function will be used instead.
 *
 * Used as a callback by wp_list_comments() for displaying the comments.
 *
 * @since Twenty Ten 1.0
 */
function twentyten_comment( $comment, $args, $depth ) {
	$GLOBALS['comment'] = $comment;
	switch ( $comment->comment_type ) :
		case '' :
	?>
	<li <?php comment_class(); ?> id="li-comment-<?php comment_ID(); ?>">
		<div id="comment-<?php comment_ID(); ?>">
		<div class="comment-author vcard">
			<?php echo get_avatar( $comment, 40 ); ?>
			<?php printf( __( '%s <span class="says">says:</span>', 'twentyten' ), sprintf( '<cite class="fn">%s</cite>', get_comment_author_link() ) ); ?>
		</div><!-- .comment-author .vcard -->
		<?php if ( $comment->comment_approved == '0' ) : ?>
			<em class="comment-awaiting-moderation"><?php _e( 'Your comment is awaiting moderation.', 'twentyten' ); ?></em>
			<br />
		<?php endif; ?>

		<div class="comment-meta commentmetadata"><a href="<?php echo esc_url( get_comment_link( $comment->comment_ID ) ); ?>">
			<?php
				/* translators: 1: date, 2: time */
				printf( __( '%1$s at %2$s', 'twentyten' ), get_comment_date(),  get_comment_time() ); ?></a><?php edit_comment_link( __( '(Edit)', 'twentyten' ), ' ' );
			?>
		</div><!-- .comment-meta .commentmetadata -->

		<div class="comment-body"><?php comment_text(); ?></div>

		<div class="reply">
			<?php comment_reply_link( array_merge( $args, array( 'depth' => $depth, 'max_depth' => $args['max_depth'] ) ) ); ?>
		</div><!-- .reply -->
	</div><!-- #comment-##  -->

	<?php
			break;
		case 'pingback'  :
		case 'trackback' :
	?>
	<li class="post pingback">
		<p><?php _e( 'Pingback:', 'twentyten' ); ?> <?php comment_author_link(); ?><?php edit_comment_link( __( '(Edit)', 'twentyten' ), ' ' ); ?></p>
	<?php
			break;
	endswitch;
}
endif;

/**
 * Register widgetized areas, including two sidebars and four widget-ready columns in the footer.
 *
 * To override twentyten_widgets_init() in a child theme, remove the action hook and add your own
 * function tied to the init hook.
 *
 * @since Twenty Ten 1.0
 * @uses register_sidebar
 */
function twentyten_widgets_init() {
	// Area 1, located at the top of the sidebar.
	register_sidebar( array(
		'name' => __( 'Primary Widget Area', 'twentyten' ),
		'id' => 'primary-widget-area',
		'description' => __( 'The primary widget area', 'twentyten' ),
		'before_widget' => '<li id="%1$s" class="widget-container %2$s">',
		'after_widget' => '</li>',
		'before_title' => '<h3 class="widget-title">',
		'after_title' => '</h3>',
	) );

	// Area 2, located below the Primary Widget Area in the sidebar. Empty by default.
	register_sidebar( array(
		'name' => __( 'Secondary Widget Area', 'twentyten' ),
		'id' => 'secondary-widget-area',
		'description' => __( 'The secondary widget area', 'twentyten' ),
		'before_widget' => '<li id="%1$s" class="widget-container %2$s">',
		'after_widget' => '</li>',
		'before_title' => '<h3 class="widget-title">',
		'after_title' => '</h3>',
	) );

	// Area 3, located in the footer. Empty by default.
	register_sidebar( array(
		'name' => __( 'First Footer Widget Area', 'twentyten' ),
		'id' => 'first-footer-widget-area',
		'description' => __( 'The first footer widget area', 'twentyten' ),
		'before_widget' => '<li id="%1$s" class="widget-container %2$s">',
		'after_widget' => '</li>',
		'before_title' => '<h3 class="widget-title">',
		'after_title' => '</h3>',
	) );

	// Area 4, located in the footer. Empty by default.
	register_sidebar( array(
		'name' => __( 'Second Footer Widget Area', 'twentyten' ),
		'id' => 'second-footer-widget-area',
		'description' => __( 'The second footer widget area', 'twentyten' ),
		'before_widget' => '<li id="%1$s" class="widget-container %2$s">',
		'after_widget' => '</li>',
		'before_title' => '<h3 class="widget-title">',
		'after_title' => '</h3>',
	) );

	// Area 5, located in the footer. Empty by default.
	register_sidebar( array(
		'name' => __( 'Third Footer Widget Area', 'twentyten' ),
		'id' => 'third-footer-widget-area',
		'description' => __( 'The third footer widget area', 'twentyten' ),
		'before_widget' => '<li id="%1$s" class="widget-container %2$s">',
		'after_widget' => '</li>',
		'before_title' => '<h3 class="widget-title">',
		'after_title' => '</h3>',
	) );

	// Area 6, located in the footer. Empty by default.
	register_sidebar( array(
		'name' => __( 'Fourth Footer Widget Area', 'twentyten' ),
		'id' => 'fourth-footer-widget-area',
		'description' => __( 'The fourth footer widget area', 'twentyten' ),
		'before_widget' => '<li id="%1$s" class="widget-container %2$s">',
		'after_widget' => '</li>',
		'before_title' => '<h3 class="widget-title">',
		'after_title' => '</h3>',
	) );
}
/** Register sidebars by running twentyten_widgets_init() on the widgets_init hook. */
add_action( 'widgets_init', 'twentyten_widgets_init' );

/**
 * Removes the default styles that are packaged with the Recent Comments widget.
 *
 * To override this in a child theme, remove the filter and optionally add your own
 * function tied to the widgets_init action hook.
 *
 * This function uses a filter (show_recent_comments_widget_style) new in WordPress 3.1
 * to remove the default style. Using Twenty Ten 1.2 in WordPress 3.0 will show the styles,
 * but they won't have any effect on the widget in default Twenty Ten styling.
 *
 * @since Twenty Ten 1.0
 */
function twentyten_remove_recent_comments_style() {
	add_filter( 'show_recent_comments_widget_style', '__return_false' );
}
add_action( 'widgets_init', 'twentyten_remove_recent_comments_style' );

if ( ! function_exists( 'twentyten_posted_on' ) ) :
/**
 * Prints HTML with meta information for the current post-date/time and author.
 *
 * @since Twenty Ten 1.0
 */
function twentyten_posted_on() {
	printf( __( '<span class="%1$s">Posted on</span> %2$s <span class="meta-sep">by</span> %3$s', 'twentyten' ),
		'meta-prep meta-prep-author',
		sprintf( '<a href="%1$s" title="%2$s" rel="bookmark"><span class="entry-date">%3$s</span></a>',
			get_permalink(),
			esc_attr( get_the_time() ),
			get_the_date()
		),
		sprintf( '<span class="author vcard"><a class="url fn n" href="%1$s" title="%2$s">%3$s</a></span>',
			get_author_posts_url( get_the_author_meta( 'ID' ) ),
			sprintf( esc_attr__( 'View all posts by %s', 'twentyten' ), get_the_author() ),
			get_the_author()
		)
	);
}
endif;

if ( ! function_exists( 'twentyten_posted_in' ) ) :
/**
 * Prints HTML with meta information for the current post (category, tags and permalink).
 *
 * @since Twenty Ten 1.0
 */
function twentyten_posted_in() {
	// Retrieves tag list of current post, separated by commas.
	$tag_list = get_the_tag_list( '', ', ' );
	if ( $tag_list ) {
		$posted_in = __( 'This entry was posted in %1$s and tagged %2$s. Bookmark the <a href="%3$s" title="Permalink to %4$s" rel="bookmark">permalink</a>.', 'twentyten' );
	} elseif ( is_object_in_taxonomy( get_post_type(), 'category' ) ) {
		$posted_in = __( 'This entry was posted in %1$s. Bookmark the <a href="%3$s" title="Permalink to %4$s" rel="bookmark">permalink</a>.', 'twentyten' );
	} else {
		$posted_in = __( 'Bookmark the <a href="%3$s" title="Permalink to %4$s" rel="bookmark">permalink</a>.', 'twentyten' );
	}
	// Prints the string, replacing the placeholders.
	printf(
		$posted_in,
		get_the_category_list( ', ' ),
		$tag_list,
		get_permalink(),
		the_title_attribute( 'echo=0' )
	);
}
endif;
